Ver. 1
May. 2015
Standard Deviation (STDEV) SOP
ImageJ, Paint & Excel
1. File preparation
1.
Take your own picture using any available camera.
2.
Locate and open "ImageJ" icon (Figure 1) on the desktop.
Figure 1. ImageJ icon
3.
Open the image file (Figure 2).
Figure 2. Image file, opened by ImageJ
4.
Get the pattern's outline/edge.
Image >> Adjust >> Color Threshold. All values on the image file which higher than the
threshold value will be marked as red color. You can change the threshold value to cover all
of your patterns. Finally, click on "Select" to get the pattern's outline (Figure 3).
Threshold
value
Figure 3. Color Threshold
1

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